lynda learning node js

Child_process is a more important module for node, which enables the creation of multi-threading to take advantage of multicore CPUs.This module provides four functions for creating child processes.Spawn, exec, execfile, fork.Spawn is the most primitive function to create a subprocess, and the remaining three is a different encapsulation of the function.Spawn does not support callback functions.Both exec and execfile support callback functions. The di

JS Create a classThen instantiate it in another program using this class1. Create a user class--------------User.js--------------function User (id,name,age) {This.id=id;This.name=name;This.age=age;This.enter=function () {Console.log ("Access to the Library");}}Module.exports = User;2. Call----------------------N3_modalcall.js-------------var http = require (' http ');var User = require ('./models/user ');Http.createserver (function (request, response)

A file is a moduleExports public interfaceCreate Exports.jsTwo common interfaces available externally: Set value, squarevar i;exports.set = function (num) {//Set value i=num; Console.log ("Seti to" +i); Exports.square = function () {//squared and output I=math.pow (i,2); Console.log ("i^2=" +i);Require Get External interfaceCreate Require.jsvar square =require ("./exports");//Load Module Square.set (5); Square.square ();Run effectAfter

Client-clients, commonly referred to as browsers, can request data from the server via the HTTP protocol. Server -a server-side, generally referred to as the Web servers, can receive client requests and send response data to the client. Business-service layer, which handles applications through Web servers, such as interacting with databases, logical operations, calling external programs, and so on. Data-the database layer, which is typically made up of databases.

starting position of the file read, and if the value of position is NULL, it is read from the position of the current file pointer.Callback-callback function, there are three parameters err, Bytesread, Buffer,err is the error message, Bytesread represents the number of bytes read, and buffer is the cache object.7. Close the file:Fs.close (FD, callback)This callback finally has no parameter!!!8. Interception of documents:Fs.ftruncate (FD, Len, callback)The parameters use the following instructio

an anonymous function.In JavaScript, a function can be a parameter to another function, we can define a function first, then pass it, or we can define the function directly where the parameter is passed.function passing is how to get the HTTP server to workWith this knowledge, let's take a look at our simple and not simple HTTP server:varHTTP = require ("http");Http.createserver (function(Request, response) {Response.writehead ($, {"Content-type": "Text/plain"});Response.Write ("Hello World");

The node. JS Learning Series has also accumulated some, to build a general index to facilitate mutual exchange of learning, the following will continue to update ^_^!As far as possible to write some and combat-related, do not talk too much of the sermon ...node.

. One-time loadingvar myModule1 = require ('./module ');Mymodule.setname (' Andy ');var myModule2 = require ('./module ');Mymodule.setname (' King ');Mymodule.sayhello ();//hello KingBecause they point to the same instance, MyModule1 is covered by myModule23. Cover exportsfunction Hello () {var name;This.setname = function (thyname) {name = Thyname;};This.sayhello = function () {Console.log (' Hello ' + name);};};Exports. Hello = hello;//before Hello is an exposed attribute to the outside world

example, a simple counter design, I login to a URL, it triggers a counter event, very natural. Of course, more importantly, JS language features, namely function, closures, similar C syntax, refining and concise style, and so on, especially Function, simply for the event model, easily coincide with the idea of node. js asynchronous mechanism, is really to attrac

example, a simple counter design, I login to a URL, it triggers a counter event, very natural. Of course, more importantly, JS language features, namely function, closures, similar C syntax, refining and concise style, and so on, especially Function, simply for the event model, easily coincide with the idea of node. js asynchronous mechanism, is really to attrac

example, a simple counter design, I login to a URL, it triggers a counter event, very natural. Of course, more importantly, JS language features, namely function, closures, similar C syntax, refining and concise style, and so on, especially Function, simply for the event model, easily coincide with the idea of node. js asynchronous mechanism, is really to attrac

This article mainly introduces Nodejs learning item [Getting Started]. If you need it, refer I. Installation First, download the installation from the http://nodejs.org. My version is 0.8.14. The installation is very simple. The next step is the next step. Then configure the installation directory in path. msi will install the npm (Node Package Manager) together. My installation directory is C: \ Program

members of the community? Did they fix the code? Do they implement clean and healthy features branch, PR, submit?If you do find someone who actively contributes a node core, well, hand it over to a nearby office.Security, backend architecture, trainingWith code open source, node. JS is also based on JavaScript, which can lead to security implications for your ap

some time ago, node. JS has been studied since the laptop hard disk has collapsed, but it is very much wanted to learn, just because of the recent efforts to learn English. Outside of the technology also needs to do well, we are not for the technology, after all, technology is our survival of a good skill, only so that can live wonderful and rich. People need to have more pursuit, to see the world, so-calle

() functionCause: The process module is a global module, FS is not a global module, and the global module can be used directlyNon-global modules require the Require () function to loadDetermine if the require () function is required to load1. Open the node document directly to see the appropriate function2. The left column of the document has the Globals module, which can be viewed directlyIn addition, in the above code, there are several output numb

entry file:Inside the index file, we initialize an associative array to hold the functions that need to be used. and turn on the server.Server file:First, we set the encoded format of the received data to UTF-8, then register the listener for the "data" event to collect the new block of data received each time and assign it to the PostData variable, and finally, we move the call to the request route to the end event handler, To make sure it only fires when all data is received and fires only on

node. js belongs to the background language, background language and Php,java, etc.Advantages: 1 Good performance node. js VS php 86 times times2. js with front table convenient3.node.js facilitates front-end learninghttps://nodejs.orgnode.

file Content if read success }); Console.log ("program execution ends!");To see how the results work:As you can see, because the asynchronous read operation is used, the script continues to execute the following code when the file is read, that is, the script goes down regardless of whether the file is read and output is complete. So you'll see that the Console.log is executed first ("------program execution is finished! ------") before you see the output" ****** this is my second demo! ". This

1. What is NPMNPM is the package Manager for node. JS, which allows developers to create, share, and reuse modules in node. JS applications. Before we installed node. JS through the Setup program on node's official website, NPM wa

threads.ModuleFile and module one by one corresponding, a file is a module, exposed to a number of external module.exports, exposed to a exportsJS single-threaded and asynchronousSingle-threaded and asynchronous does not have to be a language feature at the same time. JS chose to become a single-threaded language, so it can not be asynchronous, but JS hosting environment (such as browser,